Text input

1 files changed, 118 insertions, 21 deletions

diff --git a/examples/ui.c b/examples/ui.c
index 9f31550..c4e4719 100755
--- a/examples/ui.c
+++ b/examples/ui.c
@@ -78,6 +78,7 @@ typedef double             f64;
 
 enum {
   MAX_NUM_PIXELS        = 4 * 1024 * 1024,
+  MAX_INPUT_SIZE        = 256,
   MAX_CLIPBOARD_SIZE    = 0,
   MAX_NUM_AUDIO_SAMPLES = 0,
   MAX_NUM_SOCKETS       = 0,
@@ -88,7 +89,7 @@ enum {
   IPv4 = 1,
   IPv6 = 2,
 
-  KEY_LEFT,
+  KEY_LEFT = 128,
   KEY_RIGHT,
   KEY_UP,
   KEY_DOWN,
@@ -107,11 +108,17 @@ enum {
   KEY_END,
   KEY_PAGEUP,
   KEY_PAGEDOWN,
-  KEY_KP_     = 128,
-  KEY_F_      = 256,
-  BUTTON_LEFT = KEY_F_ + 64,
+  BUTTON_LEFT,
   BUTTON_MIDDLE,
   BUTTON_RIGHT,
+  MOD_CTRL,
+  MOD_SHIFT,
+  MOD_ALT,
+  MOD_CAPS,
+  MOD_NUM,
+  MOD_SCROLL,
+  KEY_KP_,
+  KEY_F_ = KEY_KP_ + 64,
 };
 
 typedef struct {
@@ -119,6 +126,8 @@ typedef struct {
   i32  frame_width;
   i32  frame_height;
   u32 *pixels;
+  i64  input_size;
+  i16 *input;
   i64  clipboard_size;
   c8  *clipboard; // TODO
   b8   done;
@@ -356,14 +365,22 @@ void print_text(u32 color, f64 x0, f64 y0, f64 scale_x, f64 scale_y, i64 num_cha
   }
 }
 
-void draw_text_area(u32 color, f64 x0, f64 y0, f64 width, f64 height, i64 num_chars, c8 *text) {
+void draw_text_area(u32 color, f64 x0, f64 y0, f64 width, f64 height, f64 max_scale_x, f64 max_scale_y, i64 num_chars, c8 *text) {
+  assert(max_scale_x > 1e-6);
+  assert(max_scale_y > 1e-6);
+
   i64 num_columns = enum_text_columns(num_chars, text);
   i64 num_rows    = enum_text_rows(num_chars, text);
 
   f64 scale_x = width  / num_columns;
   f64 scale_y = height / num_rows;
 
-  print_text(color, x0, y0, scale_x, scale_y, num_chars, text);
+  f64 kx = scale_x / max_scale_x;
+  f64 ky = scale_y / max_scale_y;
+
+  f64 k = kx < ky ? kx : ky;
+
+  print_text(color, x0, y0, k * max_scale_x, k * max_scale_y, num_chars, text);
 }
 
 void draw_panel(u32 color, f64 x0, f64 y0, f64 width, f64 height) {
@@ -398,6 +415,9 @@ i32 main(i32 argc, c8 **argv) {
   b8 button_1_down    = 0;
   b8 button_1_checked = 0;
 
+  i32       text_len  = 0;
+  static c8 text[512] = "";
+
   while (!platform.done) {
     p_wait_events();
 
@@ -445,7 +465,19 @@ i32 main(i32 argc, c8 **argv) {
         platform.cursor_y >= y0 && platform.cursor_y < y0 + h)
       color = 0xffffff;
 
-    draw_text_area(color, x0, y0, w, h, 27, "Hello, Sailor!\nUI edit text");
+    for (i64 i = 0; i < platform.input_size; ++i)
+      switch (platform.input[i]) {
+        case '\b':
+          if (text_len > 0)
+            --text_len;
+          break;
+
+        default:
+          if (platform.input[i] > 0 && platform.input[i] < 128 && text_len < (i64) sizeof text)
+            text[text_len++] = (c8) platform.input[i];
+      }
+
+    draw_text_area(color, x0, y0, w, h, 10., 10., text_len, text);
 
     p_render_frame();
   }
@@ -514,18 +546,66 @@ i64 p_send(u16 slot, IP_Address address, i64 size, u8 *data) {
 #include <sched.h>
 #include <time.h>
 
-static i16      _key_table[512];
-static u32      _buffer[MAX_NUM_PIXELS];
-static XImage   _image;
-static Display *_display;
-static GC       _gc;
-static Window   _window;
-static Atom     _wm_delete_window;
+static i16      _key_table[512]         = {0};
+static i16      _upper[512]             = {0};
+static u32      _buffer[MAX_NUM_PIXELS] = {0};
+static i16      _input[MAX_INPUT_SIZE]  = {0};
+static XImage   _image                  = {0};
+static Display *_display                = NULL;
+static GC       _gc                     = NULL;
+static Window   _window                 = 0;
+static Atom     _wm_delete_window       = 0;
 
 void p_init(void) {
   _display = XOpenDisplay(NULL);
   assert(_display != NULL);
 
+  _upper['0']  = ')';
+  _upper['1']  = '!';
+  _upper['2']  = '@';
+  _upper['3']  = '#';
+  _upper['4']  = '$';
+  _upper['5']  = '%';
+  _upper['6']  = '^';
+  _upper['7']  = '&';
+  _upper['8']  = '*';
+  _upper['9']  = '(';
+  _upper['a']  = 'A';
+  _upper['b']  = 'B';
+  _upper['c']  = 'C';
+  _upper['d']  = 'D';
+  _upper['e']  = 'E';
+  _upper['f']  = 'F';
+  _upper['g']  = 'G';
+  _upper['h']  = 'H';
+  _upper['i']  = 'I';
+  _upper['j']  = 'J';
+  _upper['k']  = 'K';
+  _upper['l']  = 'L';
+  _upper['m']  = 'M';
+  _upper['n']  = 'N';
+  _upper['o']  = 'O';
+  _upper['p']  = 'P';
+  _upper['q']  = 'Q';
+  _upper['r']  = 'R';
+  _upper['s']  = 'S';
+  _upper['t']  = 'T';
+  _upper['u']  = 'U';
+  _upper['v']  = 'V';
+  _upper['w']  = 'W';
+  _upper['x']  = 'X';
+  _upper['y']  = 'Y';
+  _upper['z']  = 'Z';
+  _upper['[']  = '{';
+  _upper[']']  = '}';
+  _upper[';']  = ':';
+  _upper['\''] = '"';
+  _upper['`']  = '~';
+  _upper['\\'] = '|';
+  _upper[',']  = '<';
+  _upper['.']  = '>';
+  _upper['/']  = '?';
+
   _key_table[XKeysymToKeycode(_display, XK_Left)]         = KEY_LEFT;
   _key_table[XKeysymToKeycode(_display, XK_Right)]        = KEY_RIGHT;
   _key_table[XKeysymToKeycode(_display, XK_Up)]           = KEY_UP;
@@ -641,6 +721,7 @@ void p_init(void) {
   _window = XCreateWindow(_display, XDefaultRootWindow(_display), x, y, platform.frame_width, platform.frame_height, 0, depth, InputOutput, visual, CWEventMask, &(XSetWindowAttributes) { .event_mask = KeyPressMask | KeyReleaseMask | ButtonPressMask | ButtonReleaseMask | EnterWindowMask | LeaveWindowMask | PointerMotionMask | VisibilityChangeMask | FocusChangeMask | StructureNotifyMask | SubstructureNotifyMask, });
 
   platform.pixels = _buffer;
+  platform.input  = _input;
 
   _image = (XImage) {
     .width            = platform.frame_width,
@@ -681,9 +762,10 @@ i32 p_handle_events(void) {
 
   memset(platform.key_pressed, 0, sizeof platform.key_pressed);
 
-  platform.cursor_dx = 0;
-  platform.cursor_dy = 0;
-  platform.wheel_dy  = 0;
+  platform.input_size = 0;
+  platform.cursor_dx  = 0;
+  platform.cursor_dy  = 0;
+  platform.wheel_dy   = 0;
 
   XEvent ev;
 
@@ -735,18 +817,33 @@ i32 p_handle_events(void) {
         }
         break;
 
-      case KeyPress:
+      case KeyPress: {
+        i16 k = _key_table[ev.xkey.keycode];
         platform.cursor_x = ev.xkey.x;
         platform.cursor_y = ev.xkey.y;
-        platform.key_down   [_key_table[ev.xkey.keycode]] = 1;
-        platform.key_pressed[_key_table[ev.xkey.keycode]]++;
-        break;
+        platform.key_down   [k] = 1;
+        platform.key_pressed[k]++;
+        platform.key_down[MOD_CTRL]   = !!(ev.xkey.state & ControlMask);
+        platform.key_down[MOD_SHIFT]  = !!(ev.xkey.state & ShiftMask);
+        platform.key_down[MOD_ALT]    = !!(ev.xkey.state & Mod1Mask);
+        platform.key_down[MOD_CAPS]   = !!(ev.xkey.state & LockMask);
+        platform.key_down[MOD_NUM]    = !!(ev.xkey.state & Mod2Mask);
+        platform.key_down[MOD_SCROLL] = !!(ev.xkey.state & Mod3Mask);
+        if (platform.input_size < MAX_INPUT_SIZE)
+          platform.input[platform.input_size++] = ((platform.key_down[MOD_SHIFT] ^ platform.key_down[MOD_CAPS])) && _upper[k] != 0 ? _upper[k] : k;
+      } break;
 
       case KeyRelease:
         platform.cursor_x = ev.xkey.x;
         platform.cursor_y = ev.xkey.y;
         platform.key_down   [_key_table[ev.xkey.keycode]] = 0;
         platform.key_pressed[_key_table[ev.xkey.keycode]]--;
+        platform.key_down[MOD_CTRL]   = !!(ev.xkey.state & ControlMask);
+        platform.key_down[MOD_SHIFT]  = !!(ev.xkey.state & ShiftMask);
+        platform.key_down[MOD_ALT]    = !!(ev.xkey.state & Mod1Mask);
+        platform.key_down[MOD_CAPS]   = !!(ev.xkey.state & LockMask);
+        platform.key_down[MOD_NUM]    = !!(ev.xkey.state & Mod2Mask);
+        platform.key_down[MOD_SCROLL] = !!(ev.xkey.state & Mod3Mask);
         break;
 
       case EnterNotify: platform.has_cursor = 1; break;